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1.
(Greek mythology) a river in Hades; the souls of the dead had to drink from it, which made them forget all they had done and suffered when they were alive
Lick that Lethe and come again...
by The T-spot October 19, 2008
 
2.
a bastard that does nothing but teamkill on call of duty 4
omg i hate that lethe guy he has just team kiled me- again
by Gamer 118 December 24, 2008